An abnormal localized collection of blood in which the blood is usually clotted or partially clotted and is usually situated within an organ or a soft tissue space, such as within a muscle. A hematoma is caused by a break in the wall of a blood vessel. The break may be spontaneous, as in the case of an aneurysm, or caused by trauma. The treatment depends on the location and size of the hematoma, but can involves draining the accumulated blood. A hematoma in or near the brain is particularly dangerous. The word "hematoma" came into usage around 1850. It was devised from Greek roots — hemat-, referring to the blood + -oma, from soma meaning body = a bloody body, or a collection of blood. The many different kinds of hematomas are defined by location and include: {{}}epidural hematoma, extradural hematoma, intracerebral hematoma, intracranial hematoma, nasal septum hematoma, subcutaneous hematoma, subdural hematoma.
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A localized mass of extravasated blood that is relatively or completely confined within an organ or tissue, a space, or a potential space; the blood is usually clotted (or partly clotted), and, depending on how long it has been there, may manifest various degrees of organization and decolorization. [hemato- + G. -oma, tumor]
- communicating h. SYN: pseudoaneurysm.
- corpus luteum h. SYN: corpus hemorrhagicum.
- epidural h. SYN: extradural hemorrhage.
- intracranial h. intracranial hemorrhage.
- intramural h. a h. in the wall of a structure, such as the bowel or bladder, usually resulting from trauma or excessive anticoagulation.
- subdural h. SYN: subdural hemorrhage.

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he·ma·to·ma or chiefly Brit hae·ma·to·ma -'tō-mə n, pl -mas also -ma·ta -mət-ə a mass of usu. clotted blood that forms in a tissue, organ, or body space as a result of a broken blood vessel

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he·ma·to·ma (he″mə-toґmə) [hemato- + -oma] a localized collection of blood, usually clotted, in an organ, space, or tissue, usually due to a break in the wall of a blood vessel.

Hematoma. Postoperative formation (A) and evacuation (B).

Medical dictionary. 2011.

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